Cosmetic brush



FIG. 1 is a front elevation view of an embodiment of a cosmetic brush showing the new design, the back view of the cosmetic brush being identical to the front view;

FIG. 2 is a left side view of the cosmetic brush of FIG. 1, the right side view of the cosmetic brush being identical to the left side view;

FIG. 3 is a perspective view of the cosmetic brush of FIG. 1; and,

FIG. 4 is a top view of the cosmetic brush of FIG. 1.

The broken lines in the drawings illustrate unclaimed portions of the cosmetic brush and form no part of the claimed design. It should be understood that the claimed design extends to the broken line boundaries but does not include the boundary or the area within the boundary. 

CLAIM The ornamental design for a cosmetic brush, as shown and described. 